/**
 * KHAELOR
 * File: src/tui/components/verify-strip.ts
 * Description: The verify strip — live check progress that contracts to `✓ verified 4.2s` on success (TUI v2 §5.4).
 *
 * Author: Simon-Pierre Boucher
 * Contact: contact@spboucher.ai
 */

import { truncateAnsi } from "../renderer/ansi.js";
import type { Theme } from "../theme.js";

export interface VerifyCheckState {
  check: string;
  state: "running" | "ok" | "failed";
  durationMs?: number;
  /** First error lines, shown inline on failure. */
  errorHead?: string[];
}

/**
 * Live strip while checks run:  `⟳ verify   typecheck ✓ 1.2s · tests ⠧ · lint ✓`
 * All-passed contraction:       `✓ verified 4.2s`
 * Failure keeps the failing check pinned with its first error lines.
 */
export function renderVerifyStrip(
  checks: readonly VerifyCheckState[],
  width: number,
  theme: Theme,
): string[] {
  if (checks.length === 0) return [];
  const allDone = checks.every((check) => check.state !== "running");
  const allOk = allDone && checks.every((check) => check.state === "ok");

  if (allOk) {
    const totalMs = Math.max(...checks.map((check) => check.durationMs ?? 0));
    return [
      truncateAnsi(
        ` ${theme.paint("success", "✓")} ${theme.paint("success", `verified ${(totalMs / 1000).toFixed(1)}s`)}` +
          ` ${theme.paint("dim", checks.map((check) => check.check).join(" · "))}`,
        width,
      ),
    ];
  }

  const parts = checks.map((check) => {
    if (check.state === "running") return `${check.check} ${theme.paint("teal", "⠧")}`;
    if (check.state === "ok") {
      const secs = check.durationMs !== undefined ? ` ${(check.durationMs / 1000).toFixed(1)}s` : "";
      return `${check.check} ${theme.paint("success", "✓")}${theme.paint("dim", secs)}`;
    }
    return theme.paint("error", `${check.check} ✗`);
  });
  const lines = [
    truncateAnsi(
      ` ${theme.paint("accent", "⟳")} ${theme.paint("bold", "verify")}   ${parts.join(theme.paint("dim", " · "))}`,
      width,
    ),
  ];
  for (const check of checks) {
    if (check.state === "failed" && check.errorHead !== undefined) {
      for (const errorLine of check.errorHead.slice(0, 3)) {
        lines.push(truncateAnsi(`   ${theme.paint("dim", errorLine)}`, width));
      }
    }
  }
  return lines;
}